Advanced Air Quality Inc

The company technican arrived on time and spent 2 hrs. Website indicated "before" and "after" pictures using infrared camera on every job - this was not done and I was told afterwards it has to be requested. Technician stated that it's not used anymore and is ineffective for overall scope. We have no definitive way of knowing if the high cost was worthwhile since the same strong stale, dusty and chalky smell still exists whenever the furnace operates. Told the system would be spotless; however, after only one and half weeks, the brand new, expensive filter was already significantly dirty (as though it was a few months used). Tried a second cheaper filter and it was filthy after only 4 days. Technician confirmed it was unusual. Also the Technician left the truck's exhaust hose facing the house so gas fumes came through front door (but he moved it when I noticed about 30 minutes later and asked) ; no tarp or barrier was used at door so cold air poured into home through doorway. There were 2 holes in the main hose from the truck and the hissing made me suspicious of the vacuum pressure. Technician said pressure would be fine and holes were at connectors. Company technician returned a second time 2 weeks later, put more holes in vents and did not find any residual debris or dust. Vents were not screwed back into wall. I'm certain that lots of debris and dust were removed but again, the same strong dusty smells still exists and affects my eyes and sinuses. We declined to have Benefax deodorizer and cleaner mist sprayed into our system based on information from CMHC (Canada Mortgage and Housing Corporation) website.